Doc/ale discussion corrections

[jklaise]

Updated the ALE discussion on the classification example (similar to what was done in #838) and on the main method documentation.

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Codecov Report

Merging #846 (782aa98) into master (cc7ff82) will decrease coverage by 0.24%.
The diff coverage is n/a.

❗ Current head 782aa98 differs from pull request most recent head 1c2b2fe. Consider uploading reports for the commit 1c2b2fe to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #846      +/-   ##
==========================================
- Coverage   85.26%   85.02%   -0.25%     
==========================================
  Files          74       74              
  Lines        8727     8687      -40     
==========================================
- Hits         7441     7386      -55     
- Misses       1286     1301      +15     

Flag	Coverage Δ
macos-latest-3.10	?
ubuntu-latest-3.10	?
ubuntu-latest-3.7	?
ubuntu-latest-3.8	85.02% <ø> (ø)
ubuntu-latest-3.9	85.02% <ø> (-0.10%)	⬇️
windows-latest-3.9	?

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Impacted Files	Coverage Δ
alibi/explainers/anchors/anchor_base.py	89.93% <0.00%> (-2.78%)	⬇️
alibi/datasets/default.py	93.47% <0.00%> (-2.18%)	⬇️
alibi/explainers/permutation_importance.py	96.65% <0.00%> (-0.45%)	⬇️
alibi/explainers/ale.py	97.82% <0.00%> (-0.44%)	⬇️
alibi/explainers/pd_variance.py	98.37% <0.00%> (-0.41%)	⬇️
alibi/utils/approximation_methods.py	81.81% <0.00%> (-0.41%)	⬇️
alibi/explainers/partial_dependence.py	94.38% <0.00%> (-0.22%)	⬇️
alibi/utils/missing_optional_dependency.py	94.28% <0.00%> (-0.16%)	⬇️
alibi/explainers/anchors/anchor_text.py	94.30% <0.00%> (-0.14%)	⬇️
alibi/explainers/cfrl_base.py	87.79% <0.00%> (-0.09%)	⬇️
... and 2 more